You can look up 3D printers that print in metal but they are expensive beasts using patented high end industrial technology. They print a shape depositing layer by layer, printing the area with superfine metal powder and the void with a supporting substance that can be washed or blown away later. The metal powder is fused with lasers or something similar to a microscopic weld with electricity. Consumer 3D printing works on the concept of a controlled hot glue gun mounted on an inkjet printer chassis.

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